Lifting-jack



(No Model.)

J. SCHWEGLBR.

LIPTING JACK.

Patented May 22.1883.

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.. u i v @yf-@My 3 `thecity 0f Buffalo of my improved lifting-jack. 25`cal section of thesame in liner c, Fig. 6. Fig.

` i-thejack ini line yy,

\ 3o is a top plan view.

7.35 to slide in a groove on the f PATENT OFFICE- JOSEPH, sonwnennn., or BUFFAL, New Yoan.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 278,280, dated `May 22, 1,883.

` Applicaties nieanprn 1s, issn. (No modem `To all whom it may concern `Be it known thatI, J osErH SGHWEGLR, of inthe county of Erie and y State of New York, have invented a new and useful Improvement in LiftingJacks,of which f the following is a specification.

This invention relates to animprovement in that class of lifting-jacks which are provided with a rack-bar upon which the load is sup- 1 1o ported, and` which is raised by a gear-wheel engaging with said rackbar and actuated by a hand'crank. e e The object of my invention is to construct q t alifting-jack of this character, Wherebyheavy loads can be raised withlittle effort, and in t which the rack-bar can be readily lowered and arrested at any desired point.

` My invention consists of' the peculiar construction of the lifting-jack, which win be `1 2ol hereinafter fully set forth, and pointed out in the claims.

f In the accompanying drawings, Figure l is a side elevation, and Fig. 2 a front elevation,

Fig.3 is a vertiy 4is a vertical section of the upper portion of Fig. 6. Fig. 5 is a vertical section at rightangles to Fig. 4. Fig. 6 is ahorizontal section in line z e, Fig. 1.` Fig. 7

Like letters ofrefereuce refer to like parts in the several figures.

A represents the upright frame of the liftingfjack, andB the vertical rack-bar, arranged rear side of the frame A, and provided with a head, b, and a claw, b', at its lower end, in the usual manner. c represents a pinion which engages with the `teeth of the rack-bar B, and which is 4o` mounted on or formed with ahorizontal shaft,A

d, which is journaled in suitable bearings, cl, secured to theside walls ot' the frame A.

" t E represents a spirally-toothed wheel secured to the shaft d, and F is an endless screw :formed with a horizontal shaft, f, arranged `above the wheel E, and at right angles to the shaft d of the Wheel E. i The shaftf turns in j engaging with the-wheelE, and secured to or bearings which are formed inthe endsot' two `5o levers, G G, pivoted to the front and rear l `walls of` the case A at -gThe opposite ends of g and g', respectively. the levers G G are atshaftf, andtz'is a g and engaging with the ratchet-wheel I, to preing the same.

the screwwheel E, while b y a reverse movement ot' the-crosshead the shaft f and its screw F are lowered and the latter caused to engage with the wheel E.

I represents a ratchet-wheel secured to the pawl pivoted to the frame A,

vent a retrograde movement ot' the shaft j' in a well-known manner. J is a hand-crank securedto the outer end of the shaft f for rotat- Kis an eccentric pivoted to the sidewall of the frame A, and engaging in a slotJc, formed in the cross-head H, so that by turning the eccentric K on its pivot the cross-head His raised l or lowered.

A L is an arm formed on the eccentric K, and l is a handle pvoted to the-arm L and pressed outward by a spring, l', interposed between the handle l and the arm L.

M represents a catch secured to the frame A, and provided with a notch, lm, into which the handle lis pressed by the spring l when in an upright position,therebylockingthearm L and-eccentric K in this position, in which the cross-head II holds the screw F in engaget ment with the wheel E. When the parts are in this position, as represented in Figs. 1, `2, 3, and 5, the rack-bar B is raised by turning the crank J in the direction indicated by arrow in Fig. 2. It' it is desired to lower the rack-bar B, the pawl t is disengaged from the the wheel I and the arm L released by pushing the hand'le Z out ot' the notch m. The eccentric K is then turned down, whereby the cross-head H is lowered and the shaft-f and screw F are raised, thereby disconnecting the wheel E and rack-bar B from the worm-wheel and permittin gthe rack-bar to descend by its own weight. lf it is desired Ato arrest the downward move- 4ment of the rack-bar beforeitreachesits lowest position, this is easily accomplished by returning the eccentric to its upper position, whereby the screw Fis brought into engagement with the wheel E, and the movement of the latter and of the rack-bar are instantaneously arrested. The screw F exerts considerable power upon the gear-rack bythe intermediate gear-wheels, thereby enabln gheavy loads to be raised by this lifting-jack; and this power may be further increased by placing a gear-wheel on the screw-shaft and applying the power to this gear-wheel by an endless screw engaging therewith.

I claim asmy invention- 1. 'The combination, with the rack-barB, of the pinion c, wheel E, actuating-screw F, shaft j', levers G G', cross-head H, and mechanism, substantially as described, whereby'the cross head can be raised or lowered at desire, substantially as set forth.

2. The combination, with the rack-bar B, of the pinion c, Wheel E, screw F, shaft f, levers G G cross-head H, eccentric K, provided with an arm, L, and spring-catch l' M, substantially as set forth.

JOS. SHVVEGLER.

Witnesses JNO. J. BONNER, CHAs. F. GEYER. 

